<template>
    <div class="goodsinfo-container">
        <transition
        @before-enter="beforeEnter"
        @enter="enter"
        @after-enter="afterEnter"
        >
            <div class="ball" v-show="ballFlag" ref="ball"></div>
        </transition>
        <!--商品轮播图区域-->
        <div class="mui-card">
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <swiper :lunbotuList="lunbotuList" :isfull="false"></swiper>
                </div>
            </div>
        </div>
        <!--商品购买区域-->
            <div class="mui-card">
                <div class="mui-card-header">{{goodsinfo.title}}</div>
                <div class="mui-card-content">
                    <div class="mui-card-content-inner">
                        市场价:<del>¥{{goodsinfo.market_price}}</del>&nbsp;&nbsp;&nbsp;&nbsp;到手价:<span class="now_price">¥{{goodsinfo.sell_price}}</span>
                        <div class="amount">
                            <p style="margin-top:8px">购买数量:&nbsp;</p><numbox @getCount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>
                        </div>
                        <p>
                            <mt-button type="primary" size="small">立即购买</mt-button>
                            <mt-button type="danger" size="small" @click="addToShopCart">加入购物车</mt-button>
                        </p>
                    </div>
                </div>
            </div>
        <!--商品参数区域-->
        <div class="mui-card">
            <div class="mui-card-header">商品参数</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p>商品货号:{{goodsinfo.goods_no}}</p>
                    <p>库存情况:{{goodsinfo.stock_quantity}}</p>
                    <p>上架时间:{{goodsinfo.add_time | dataFormat }}</p>
                </div>
            </div>
            <div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
            </div>
        </div>
    </div>
</template>

<script>
    import swiper from '../subcomponents/swiper.vue'
    import numbox from '../subcomponents/goodsinfo_numbox.vue'

    import info1 from '../../images/detail01.jpg'
    import info2 from '../../images/detail02.jpg'
    import info3 from '../../images/detail03.jpg'
    import info4 from '../../images/detail04.jpg'
    import info5 from '../../images/detail05.jpg'

    export default {
        data(){
            return{
                id: this.$route.params.id,
                ballFlag:false, //控制小球隐藏和显示的标识符
                selectedCount: 1,   //保存用户选中商品数量 默认为1
                lunbotuList:[
                    {src: info1, img: info1},
                    {src: info2, img: info2},
                    {src: info3, img: info3},
                    {src: info4, img: info4},
                    {src: info5, img: info5},
                ],
                goodsinfo:{
                    add_time:'2019-1-28 17:32:39', goods_no:'MJLP7142', id:89, market_price:'305', sell_price:'244', stock_quantity:'12', title:'【WV PROJECT】韩国官网正品 18春男女字母休闲裤'
                }
            }
        },
        created(){
            this.getLunbotu();
            this.getGoodsInfo();
        },
        methods:{
            getLunbotu(){       //获取轮播图数据的方法
                this.$http.get('api/getthumimages/' + this.id ).then(result => {
                    if(result.body.status === 0){
                        //先循环轮播图的每一项并item添加img属性 因为轮播图组件中 只认识item.img
                        result.body.message.forEach(item => {
                            item.img = item.src
                        });
                        this.lunbotuList = result.body.message;
                    }
                })
            },
            getGoodsInfo(){
                this.$http.get('api/goods/getinfo/' + this.id ).then(result => {
                    if(result.body.status === 0){
                        this.goodsinfo = result.body.message;
                    }
                })
            },
            goDesc(id){     //使用编程式导航跳转到图文界面
                this.$router.push({name:'goodsdesc', params:{id}})
            },
            goComment(id){     //使用编程式导航跳转到评论
                this.$router.push({name:'goodscomment', params:{id}})
            },
            addToShopCart(){
                this.ballFlag = !this.ballFlag;
                //拼接出要保存到store中car数组的商品信息对象
                var goodsinfo = {id: this.id, count: this.selectedCount, price: this.goodsinfo.sell_price, selected: true };
                this.$store.commit('addToCar', goodsinfo);  //调用store中的方法来将商品加入购物车
            },
            beforeEnter(el){
                el.style.transform = "translate(0,0)"
            },
            enter(el, done){
                el.offsetWidth;

                //小球动画优化思路
                //1. 导致动画不准确的原因 是小球最终位置已经局限在某一分辨率的滚动条未滚动的情况下
                //2. 动态计算坐标值
                //3. 思路: 先得到徽标的横纵坐标 再获取小球的横纵坐标 然后让x y值求差 得到横纵坐标的位移
                //4. domObject.getBoundingClintRect() 获取元素左上角的top和left值

                //获取小球在页面中的位置
                const ballPosition = this.$refs.ball.getBoundingClientRect();
                //获取徽标在页面中的位置
                const badgePosition = document.getElementById('badge').getBoundingClientRect();
                const xDist = badgePosition.left - ballPosition.left;
                const yDist = badgePosition.top - ballPosition.top;

                el.style.transform = 'translate('+xDist+'px, '+yDist+'px)';
                el.style.transition = "all 0.7s cubic-bezier(.4, -0.3, 1, .68)";
                done()
            },
            afterEnter(el){
                this.ballFlag = !this.ballFlag;
            },
            getSelectedCount(count){
                //当子组件把选中数量传递给父组件时 保存到data上
                this.selectedCount = count;
            }
        },
        components:{
            swiper,
            numbox
        }
    }
</script>

<style lang="scss" scoped>
    .goodsinfo-container{
        background-color: #eee;
        overflow: hidden;
    }
    .now_price{
        color:red;
        font-size:16px;
        font-weight: bold;
    }
    .amount{
        display: flex;
        justify-content: flex-start;
        align-items: center;
    }
    .mui-card-footer{
        display:block;
        button{
            margin:15px 0 ;
        }
    }
    .ball{
        width:15px;
        height:15px;
        border-radius: 50%;
        background-color: red;
        position:absolute;
        z-index: 99;
        top:430px;
        left:146px;
    }
</style>